The closed trap bar, has a hexagonal or rectangular shape that surrounds you completely when you're inside it.
"half hex" or "frame" trap bar, features a frame that's open on one side. Allowing you to step into the bar from the front.
Ideal for beginners, those with mobility limitations, and anyone who prefers an easier entry and exit. Plus you get in-built jacks for easy plate loading.
But for trap bars, just if you prefer easy entry an exit or if you want built in jacks - then get open design. Rest hex trap bar is always good.